Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Electrohydraulic"”.
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Programmable electrohydraulic valve
"Inferred flow feedback was a new concept in which the internal pressure measurements from the programmable valve could be used to calculate a flow through any of the cartridge valves, thus eliminating the need for external feedback devices in the hydraulic system: a ""smart"" valve. Hardware …
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Design of an electrohydraulic servovalve.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1965. M.S.
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Precision Motion Control of Electrohydraulic Actuators
2. Nonlinear dynamics of the electrohydraulic actuator are represented by linear periodic models obtained from linearization about nominal input trajectories and output trajectories corresponding to periodic reference trajectories. The correct identification methodology is developed and utilized. …
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Novel Energy Efficient Electrohydraulic Steer-By-Wire Technology
<p>Improving energy efficiency, productivity, safety, and comfort of mobile machines is of utmost priority to original equipment manufacturers, suppliers, and consumers given the escalating fuel prices and increased awareness to the environment and workplace hazards. A major breakthrough in the …
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Development of high-response piezo servovalves for improved performance of electrohydraulic cylinder drives
… piezo-servovalves for improved performance of electrohydraulic cylinder drives. Performance improvement means in the context of this work an enhancement of reference and disturbance response of the drive in a closed-loop pressure and position control. Reference and disturbance responses …
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Advanced oxidative water treatment process using an electrohydraulic discharge reactor and TiO2 immobilised on nanofibres
The aim of this study was to design and build an electrohydraulic discharge reactor in such a way that the synthetic immobilized TiO2 nanophotocatalytic components could be integrated, for the production of active species such as OH radicals, ozone and hydrogen peroxide, as a cocktail to clean …
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Iterative Learning Control of an Electrohydraulic Injection Molding Machine With Smoothed Fill -to -Pack Transition and Adaptive Filtering
The control algorithms are implemented and tested on an industrial IMM as well as a smaller physical testbed. The results of the experimental investigations demonstrate several things. The system model is shown to be very accurate and provides an excellent simulation environment for rapid …
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Robust Repetitive Control and Its Application
… OPRRC and TPRRC are successfully applied to an electrohydraulic actuator for non-circular machining of camshaft to show their effectiveness. A dual stage actuator using an electrohydraulic actuator and a piezoelectric actuator is developed to further reduce cam profile tracking errors. The …
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Magnetic Switches as Active Device Replacements for Harsh Environments
… applications are for the purpose of simplifying electrohydraulic drill and electrocrushing designs meant for extreme environment operation, outside of the normal operating parameters of most switching technologies available to the modern electrical engineer. Since the nonlinear behavior of …
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Evolution of microstructure and crystalline texture in aluminum sheet metal subjected to high strain rate biaxial deformation
Electrohydraulic forming was used to biaxially stretch commercial Aluminum 5052 sheet metal workpieces at a high strain rate. Annealed and unannealed workpieces were formed. Specimens were taken from unformed metal and from the formed workpieces. Microstructures were examined with optical …
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Control of Multiple Degree of Freedom Fast Tool Stages for Noncircular Turning Process
… actuator inside of the hollow piston of an electrohydraulic actuator system, so it has another degree of freedom in addition to the main tool motion. Cascading two SISO control loops results in the squaring effect on the overall sensitivity function and improves the tracking performance. …
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A Hybrid Adaptive and Robust Control Methodology With Application to Active Vibration Isolation
… broad-band active vibration isolation with electrohydraulic actuation. Two new methods, the velocity-tracking approach and the position-tracking approach, are proposed and implemented in a custom-built multiple degree-of-freedom active vibration isolation testbed. These approaches circumvent …
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DESIGN, MANUFACTURING, AND CHARACTERIZATION OF SOFT, CAPACITIVE ACTUATORS AND ARCHITECTED DIELECTRIC ELASTOMERS
… for the additive manufactur- ing of soft, electrohydraulic tentacle actuators. A photo-curable, elastomeric silicone-urethane with strong dielectric properties (εr ≈ 8.8 at 1 kHz) serves as the encapsulating material for ionically-conductive hydrogel and silver paint electrodes that …
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Transfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling system
… drilling (RVD) system driven with an electrohydraulic inertial mass exciter. The RVD system is a hybrid drilling system consisting of a conventional rotary drilling system assisted by forced harmonic vibrations. The model includes a drill string with continuously distributed inertia, …
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Use of axiomatic design principles to develop vehicle suspension controls for variable stiffness and ride height
… the design for the fluid chamber system uses an electrohydraulic servovalve design.
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Fault tolerant control of active trailer steering systems for multi-trailer articulated heavy vehicles
… consisting of a hydraulic actuator and an electrohydraulic control valve. The hydraulics for the ATS system are validated using MathWorks Simscape. To enhance the hydraulic control system’s robustness and reliability, FTC is applied. Numerous model-based fault diagnosis techniques such as …
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A design and performance prediction method for axial piston pumps with integral controls
… response of servo controlled pumps by manual and electrohydraulic control.
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A Study of the Application of Low Frequency Oscillations to Multi-Tool Drawing Processes
… bull block, the tools being oscillated by two electrohydraulic vibrators, Mild steel wire and medium carbon steel tube were selected for the workpieces, and sodium stearate, as the lubricant. Results show that when wire is drawn through two dies in tandem which are oscillated axially and in …
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Intelligent control of a class of nonlinear systems
… convergence rate. Simulation results on an electrohydraulic actuator show that the robust Takagi-Sugeno fuzzy controller can reduce steady-state error under different conditions while maintaining better responses than the other robust sliding mode controllers can.</p> <p>Next, the study …
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